dickson



NT nu,

II. l

J. DICKSUN STEAM BOILER.

(Application ined'nar. so, 189s.)

me nonms Krans co. puorouruo.. wnsnmmom D, c.

1%N mw (No Model) Z'ZESSeS:

J. DICKSON.

STEAM BUILER.

(Applicatioh mea mar. so, 1898.

YN: Nonms PETER: co, noTaL|mo..wAsHmcTo-. uv c.

EUNTTED STATES PATENT OFFICE.

JOHN DIOKSON, OF NEV YORK, N. Y.

STEAM-BOILER.

SPECIFICATION forming leert of :Letters Patent No. 614,704, datedNovember 22, 189s.

Application filed March 30, 1898. Serial No. 675,750. (N0 model.)

T0 all whom/t may concern:

Be it known that I, JOHN Dickson, a citizen of the United States,residing at New York, in the county of New York and State of New York,have invented certain new and useful Improvements in Steam-Boilers; andI do hereby declare the following to be a full, clear, and exactdescription of the invention, such as will enable others skilled in theart to which it appertains to make and use the same.

This invention relates to steam-boilers, and particularly to thosedesigned for high pressures.

The objects of 4the invention are to construct a boiler of this class ina manner such that very little bracing will be necessary; also, toprovide a large grate-surface and so locate the fire-box that themaximum effect of the heat therein maybe available, and withal toproduce a boiler that shall be easily constructed, which shall have ahigh factor of safety, and a high degree of durability.

With these objects in View the invention consists in the construction,combination, and arrangement of parts hereinafter fully described, andset forth in the claims.

In the accompanying drawings, which form a part of this specification,Figure 1 represents the improved boiler in longitudinal verticalsection, said section being taken in the plane indicated by the line 11, Fig. 2. Fig. 2 represents a partially-sectionized end elevation ofthe boiler.

The main portion of the boiler consists of the cylindrical section 3, tothe head 4 of which are connected side by side two smaller sections 5and 6, said head being provided with apertures corresponding to theinternal diameters of said smaller sections. The lower portion of thehead 4 is connected to the head 7 by means of the tubes 8, which areexpanded at their ends into each of said heads in the usual manner. Theheads 9 of the sections 5 and 6 are connected to the head 7 of thesection 3 by means of the tubes 10, which are likewise expanded intosaid heads in the usual manner. The only portions of the boiler-headsunsupported by the tubes are the upper portions of the heads 4 and 7,which are above the levels of the sections 5 and 6. These portions ofsaidheads may be stayed in the usual manner, as by bolts 11. The shellof section 3 is preferably extended beyond the head '7 to form the backconnectionchamber 12, which serves as an uptake for the products ofcombustion passingfrom tubes 8 into tubes 10. This chamber may for thepurpose of cleaning be provided with a suitable door, as indicated at 13by dotted lines.

The fire-box, as shown, is located under the sections 5 and 6 and islianged thereto and to section 3, the grates of said box being indicatedat 14. This box is lined with tile or fire-brick on all surfaces savethat under the grates and those presented by the head of sections 3 andthe under side of sections 5 and 6. These tiles are indicated at 15 andare preferably secured in place by bolts 16, which pass through them andthe walls of the fire-box. The back connection-chamber 12 is lined in asimilar manner on all of its inner surface excepting that formed by thehead of section 3. Before putting these'tiles in place a layer ofasbestos 15', preferably in the form of sheets, is placed against thesurfaces to be covered by the tiles. This not only acts as anon-conductor but provides for more securely holding the tiles in placeand for preventing access of the fire or products of combustion to themetal of the iirebox between the tiles.

To the front end or heads 9 of the sections 5 and G are secured thelower portions of the smoke pipe or stack, as indicated at 17. Theseportions of the stack are continued into the Y-shaped connecting-section18, from the upper portion of which the stack proper continues.

To insure equal draft for each side of the boiler, a partition, asindicated at 19, is inserted vertically through the middle of saidconnection.

The capacity and efficiency of this boiler is materially increased bylocating in the chamber 12 a coil of pipe, as 20, which shall serve forheating the feed-water. This coil may also serve as a means ofmaintaining circulation in the boiler and for that purpose is connectedat one end to the lower portion of section 3, as indicated at 21, and atthe other end to said section at a higher elevation, as indicated at 22.By this connection also cir- IOO eulation may be maintained in thefeed-water coil at times when no feed-water is flowing through it. Thepipe for supplying water to said coil is indicated at 23 and isconnected to the coil 2O at the lowest' portion thereof. Check-valves,as 24 and 25, may be located in the extremities of the coil 2O toregulate the tiow of water through the coil.

In the ordinary operation of the boiler the feed-Water will enter thecoil through pipe 23 and be prevented from going directly into theboiler by the checlnvalve 24:. It will, however, be admitted to theboiler after circulating through the coil 2O bypassing the checkvalve25. A check-valve, as 26, may also be located in the pipe leading fromthe feedpump, so that should the pressui'e in the coil 2O exceed that ofthe pump the hot water may not be forced back into the pump. Should atany time the supply of feed-water to the coil cease and the pressure inthe coil exceed that in the boiler, relief will be given to the coilthrough the check-valve 25, and the water from the lower portion of theboiler may iiow into the coil through the check-valve 2st.

It will be noticed that tubes S are larger than tubes l0, and said tubesS may be made still larger. Indeed, it is contemplated substitutingllues therefor in adapting the boiler to low-pressure service or forburning soft coal. In either case it is necessary only that the carryingcapacity of the tubes or flues in the lower portion of section 3 beproperly proportioned to that of tubes l0, carrying the products ofcombustion from chamber l2 to the smole-stacl- By the construction ofboiler shown and described it will be observed that a large amount ofsurface of the boiler-sections themselves is presented to the directheat of the fire and that the products of combustion by having it passthrough only comparatively short tubes in the lower portion of theboiler still possess a high degree of heat as they enter the longertubes on their Way to the smokestacl. Then, too, by locating thefeed-water heater as described the feed-water may be raised nearly tothe steam-point before it enters the boiler, and because of thisadvantage the size of the boiler may be materially decreased.

The tiling and asbestos lining of the iirebox and the uptake-chamberalso conserves heat energy to a large degree and provides for a higherefficiency in producing steam.

The usual appurtenances of the boiler are employed in this as in otherboilers-such, for instance, as the blow-oft 27, the handhole 2S, and themanhole 29.

Many changes may be made in the form and construction of parts hereinshown and described without departing from the invention, one suchchange residing simply in the multiplication of the number of smallsections to be attached to the large section. Another change in theconstruction shown may be made by substituting water-legs of the usualconstruction and in the usual way for the brick-lined walls of the`lire-box and the back connection.

No claim is herein made to the feed-water heater, as it will be made thesubject-matter for a divisional application.

The invention claimed is- 1. In a boiler, thecombination with onesection, of a series of smaller sections placed side by side to liewithin the cross-sectional limits of said first-named section andconnected to the head of the larger section, the interior of saidsections communicating with one another.

2. In a boiler, the combination with one section, of a series of smallersections placed side by side to lie within the cross-sectional limits ofsaid first-named section and connected to the head of the largersection, and a nre-box built under the smaller sections and against thehead of the larger section.

3. In a boiler, the combination with one section, of a series of smallersections placed side by side to lie within the cross-sectional limits ofsaid first-named section and connected to the head of the largersection, tubes extending continuously through the smaller sections andthe larger section, and other tubes extending through the larger sectionbelow the junction of the said smaller sections.

4l. In a steam-boiler, the combination with a section as 3, of a seriesof smaller sections 5 and G, secured to section S, over openings in thehead thereof, fines extending through the larger and the smallersections, and other tubes extending through the larger section only, theback connection-chamber 12, and the lire-box built under the smallersections and against the head of the larger section, substantially asset forth.

IOO

5. In a steam-boiler having comparatively short tubes or fines leadingfrom the ire-box and long tubes or flues leading tothe smokestack, abackconnection-chamber for the passage of the products of combustion ontheir Way from the shorter to the longer tubes, and a lining of asbestosand lire-brick secured to the outer walls of said chamber said asbestoslining extending continuously of the chamber and across the jointsbetween said rirebrick.

6. The combination with the large section 3, and the smaller sections 5and G, secured to the head thereof, of the fire-box under the smallersections and attached thereto and to the end of the larger section, of alining of iire-brick and asbestos bolted to the outside walls of thefire-box, the asbestos lining arranged between the fire-brick and thechambers walls and extending continuously across the joints between thefire-brick as and for the purpose set forth.

7. The combination with a boiler having sections as 5 and G, locatedside by side, of a smoke-head for each, a Y connection into between thefire-brick, as and for the purpose which said heads discharge, and avertical set forth. partition in said connection, substantially asSigned at New York, in the county of New and for the purpose set forth.York and State of New York, this 25th day p 5 8. In a steam-boiler, thecombination with of March, A. D. 1898.

a metallic lre-boX, of a lining of fire-brick JOHN DICKSONi and asbestosbolted to the .outside walls of the fire-box, the asbestos lining beingarranged Witnesses: between the nre-brick and the metallic walls WVM. H.OAPEL, io and extending continuously across the joints DELBERT H.DECKER.

